For condition 4 (posslope), the weight is always 0. You can't compute a slope if all the values are the same.
doug
On 10/29/2013 10:44 AM, Suzanne Oosterwijk wrote:
Hi Doug,
Attached is the Xtmp.mat file for the analysis that gets the error.
Thanks for your response on the second question. I am not sure what you mean with demeaning, so I guess that I am not doing that :-) I just wanted to make sure that not getting the same results does not indicate a fundamental problem in my paradigm files.
Thanks!
Suzanne
<mailto:greve@nmr.mgh.harvard.eduOn Tue, Oct 29, 2013 at 3:31 PM, Douglas N Greve <greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>> wrote:
Hi Suzanne, can you send me the Xtmp.mat file that gets created?
On your second question, the answer might be a little tricky.
First, are you demeaning the modulation value? If not, then you
can certainly get different maps. The other part is that you can
get unpredicatable results because the design matrix is not
orthogonalbecause you have several event types.
doug
On 10/28/2013 12:30 PM, Suzanne Oosterwijk wrote:
Hi Doug,
I am running parametric modulation analyses in which I am
modeling 5 different ratings given by participants in response
to images. To model these ratings I made paradigm files
defining both the onset and the slope for each trial (see
email exchange below). Since I have 5 different ratings, I
made 5 different paradigm files per participant, per run.
These paradigm files hold the exact same trial sequence, only
with different numbers for the slope condition. When running
selxavg3-sess I get the following error:
Input to SVD must not contain NaN or Inf.
Error in cond (line 36)
s = svd(A);
Error in fast_selxavg3 (line 279)
XCond = cond(XtX);
The strange thing is that selxavg3-sess stops running at a
particular participant when I am trying to model one
particular rating, whereas the exact same analysis for the
other three ratings I have run so far (for the same
participant) does not result in an error. I checked the
paradigm files over and over but I cannot find the mistake.
The paradigm files are all the same in terms of timing and
condition codes etc., the only thing that is different between
the files are the specific ratings per trial. So I really
don't understand why I get this error. I attached the paradigm
files for the erroneous analysis and also for the analysis
that runs successfully. I also attached the selxavg3-sess
logfile for the an erroneous analysis and for the successful
one. Maybe I am missing something here, but I just don't see it.
Also, I have one other question concerning the parametric
modulation. As I understand it modeling the onset is the same
analysis as a normal contrast comparing a particular condition
against baseline. I compared the onset significance maps
(comparing onset to baseline) for each separate rating, and to
my surprise they are not the same. Since only the ratings
differ between the different analyses, and not the onset times
of the stimuli, I expected those maps to be completely
identical. Am I right in this assumption, or is there a reason
they can be different?
Thanks!
Suzanne
On Thu, Aug 15, 2013 at 4:28 PM, Douglas Greve
<greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu><mailto:greve@nmr.mgh.harvard.edu
<mailto:greve@nmr.mgh.harvard.edu>>> wrote:
Hi Suzanne, that is fine
doug
On 8/14/13 7:13 AM, Suzanne Oosterwijk wrote:
Hi Doug,
Just a follow-up question. The ratings that I
collected for the
parametric modulation analysis have a range from 0 to
1. This
means that the weights for some stimuli will have the
value 0. Is
this a problem? I am asking just to make sure that a
weight of 0
does not exclude the corresponding data-point.
Thanks,
Suzanne
On Fri, Jul 26, 2013 at 7:14 PM, Douglas Greve
<greve@nmr.mgh.harvard.edu
<mailto:greve@nmr.mgh.harvard.edu>
<mailto:greve@nmr.mgh.harvard.edu>>> wrote:
Hi Suzanne, yes that looks correct.
doug
On 7/26/13 9:27 AM, Suzanne Oosterwijk wrote:
Hello all,
I want to perform a parametric modulation
analysis in
Freesurfer and I have a question about how to
adapt my
paradigm file. I understand how to code the
offset and the
slope (by adding the individual ratings as the
slope
weight), but I just want to check whether I am
correctly
modelling the trials of no interest.
I have presented people with negative,
positive and neutral
images all preceded by a fixation cross. I
have individual
ratings for the negative images that I want to
use for the
parametric modulation analysis, but I don't
have any ratings
for the positive and neutral images. I do want
to model
these images and the fixation cross, however,
to make sure
that do not become part of the null. Based on
the wiki I
adapted my paradigm file like this:
(1 = offset for the negative image; 2 = slope
for the
negative image; 3 = neu/pos image of no
interest; 4 = fixation)
00121NULL
12431fix
15131negoffset
1523.79negslope
18431fix
21331neu/pos
24431fix
27131negoffset
27231.00negslope
30431fix
33131negoffset
3323.49negslope
36091NULL
etc.
Is this correct?
Thanks so much for responding!
Suzanne
--
Suzanne Oosterwijk, Ph.D.
Postdoctoral Researcher
Department of Social Psychology
University of Amsterdam
s.oosterwijk@u <mailto:s.oosterwijk@neu.edu
<mailto:s.oosterwijk@neu.edu>>va.nl <http://va.nl>
<http://va.nl>
https://sites.google.com/site/suzanneoosterwijk/
__._,_.___
Reply via web post
<http://groups.yahoo.com/group/martinos-tech/post;_ylc=X3oDMTJwM2ltbGk0BF9TAzk3MzU5NzE0BGdycElkAzQ5ODAyNjAEZ3Jwc3BJZAMxNzA1NzI4NjExBG1zZ0lkAzU4MzAEc2VjA2Z0cgRzbGsDcnBseQRzdGltZQMxMzc0ODQ1MjUy?act=reply&messageNum=5830>
Reply to sender<mailto:suzanne.oosterwijk@gmail.com
<mailto:suzanne.oosterwijk@gmail.com>?subject=Re%3A%20parametric%20modulation>
Reply to group
<mailto:martinos-tech@yahoogroups.com
<mailto:martinos-tech@yahoogroups.com>?subject=Re%3A%20parametric%20modulation>Start a New Topic<mailto:martinos-tech-traditional@yahoogroups.com>?subject=Change%20Delivery%20Format:%20Traditional>,
<http://groups.yahoo.com/group/martinos-tech/post;_ylc=X3oDMTJlMGwxMWZ1BF9TAzk3MzU5NzE0BGdycElkAzQ5ODAyNjAEZ3Jwc3BJZAMxNzA1NzI4NjExBHNlYwNmdHIEc2xrA250cGMEc3RpbWUDMTM3NDg0NTI1Mg-->
Messages in this topic
<http://groups.yahoo.com/group/martinos-tech/message/5830;_ylc=X3oDMTM0bWtjcmt0BF9TAzk3MzU5NzE0BGdycElkAzQ5ODAyNjAEZ3Jwc3BJZAMxNzA1NzI4NjExBG1zZ0lkAzU4MzAEc2VjA2Z0cgRzbGsDdnRwYwRzdGltZQMxMzc0ODQ1MjUyBHRwY0lkAzU4MzA->
(1)
Recent Activity:
Visit Your Group
<http://groups.yahoo.com/group/martinos-tech;_ylc=X3oDMTJlNWFnMGY0BF9TAzk3MzU5NzE0BGdycElkAzQ5ODAyNjAEZ3Jwc3BJZAMxNzA1NzI4NjExBHNlYwN2dGwEc2xrA3ZnaHAEc3RpbWUDMTM3NDg0NTI1Mg-->
Yahoo! Groups
<http://groups.yahoo.com/;_ylc=X3oDMTJkNzk1aW9nBF9TAzk3NDc2NTkwBGdycElkAzQ5ODAyNjAEZ3Jwc3BJZAMxNzA1NzI4NjExBHNlYwNmdHIEc2xrA2dmcARzdGltZQMxMzc0ODQ1MjUy>
Switch to: Text-Only
<mailto:martinos-tech-traditional@yahoogroups.com
Daily Digest
<mailto:martinos-tech-digest@yahoogroups.com
<mailto:martinos-tech-digest@yahoogroups.com>?subject=Email%20Delivery:%20Digest>
• Unsubscribe
<mailto:martinos-tech-unsubscribe@yahoogroups.com
<mailto:martinos-tech-unsubscribe@yahoogroups.com>?subject=Unsubscribe>• Terms of Use<mailto:ygroupsnotifications@yahoogroups.com>?subject=Feedback%20on%20the%20redesigned%20individual%20mail%20v1>
<http://docs.yahoo.com/info/terms/> • Send us
Feedback
<mailto:ygroupsnotifications@yahoogroups.com
.
__,_._,___
The information in this e-mail is intended only
for the
person to whom it is
addressed. If you believe this e-mail was sent to
you in
error and the e-mail
contains patient information, please contact the
Partners
Compliance HelpLine at
http://www.partners.org/complianceline . If the e-mail was
sent to you in error
but does not contain patient information, please
contact the
sender and properly
dispose of the e-mail.
--
Suzanne Oosterwijk, Ph.D.
Postdoctoral Researcher
Department of Social Psychology
University of Amsterdam
s.oosterwijk@u <mailto:s.oosterwijk@neu.edu<http://va.nl><mailto:s.oosterwijk@neu.edu>>va.nl <http://va.nl> <http://va.nl>
https://sites.google.com/site/suzanneoosterwijk/
--
Suzanne Oosterwijk, Ph.D.
Postdoctoral Researcher
Department of Social Psychology
University of Amsterdam
s.oosterwijk@u <mailto:s.oosterwijk@neu.edugreve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>
Phone Number: 617-724-2358 <tel:617-724-2358>
Fax: 617-726-7422 <tel:617-726-7422>
Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
<http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting>
FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2
www.nmr.mgh.harvard.edu/facility/filedrop/index.html
<http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html>Outgoing:
ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/
--
Suzanne Oosterwijk, Ph.D.
Postdoctoral Researcher
Department of Social Psychology
University of Amsterdam
s.oosterwijk@u <mailto:s.oosterwijk@neu.edu>va.nl <http://va.nl>
https://sites.google.com/site/suzanneoosterwijk/
--
Douglas N. Greve, Ph.D.
MGH-NMR Center
greve@nmr.mgh.harvard.edu
Phone Number: 617-724-2358
Fax: 617-726-7422
Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2
www.nmr.mgh.harvard.edu/facility/filedrop/index.html
Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/
Suzanne Oosterwijk, Ph.D.
Postdoctoral Researcher
Department of Social Psychology
University of Amsterdam